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Q.

Two cells with unequal emfs of 2V and 3V are connected as shown in the figure. If each cell has an internal resistance r=0.45Ω and external resistance is of 4Ω.. Then, potential drop across resistor 4Ω is

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a

5.32V

b

1.5V

c

2.37 V

d

3.28V

answer is B.

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Detailed Solution

Eeq=E1/r1+E2/r21/r1+1/r2=2.5v,

req=r/2,

i=EeqR+req=58.45A, 

V=iR=58.45×4=2.37V

 

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